People who care for the welfare of others frequently use the words 'we', 'us', 'friends', 'family', 'health' and 'home' on the micro-blogging site, according to an analysis by IBM research in San Jose, California.
Those who do not have those qualities are more likely to use the words 'work', 'school', 'job', 'music' and 'beer'.
Perfectionists can be identified by their use of the words 'perfect' and 'chauffeur'. People who settled for just good enough used the words 'mix', 'half' and 'fix'.
Researchers have interviewed 4,243 employees to collect 450,000 pieces of data to ensure that the analysis measures the sort of characteristics sought by employers.
They work on the premise that five basic psychological traits are needed for the right balance: extroversion, being agreeable, conscientious and open, and having the correct dash of neuroticism.
The software scans a target's Twitter postings to assess their mix.
Conscientious people discuss their achievements and use language to highlight distinctions while the worriers use words about being unwell, discuss negative emotions and talk less about topics such as family, it said.
Using shorthand such as 'ur' or '2day' is a sign of a lack of openness.
